| Cardiovascular
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Allergic vasculitis, anemia, aneurysm, angiosarcoma, arterial insufficiency, arterial thrombosis, arterio-venous malformation, arteriovenous fistula, arteriovenous malformation, atheroma, atherosclerosis, cholesterol embolism, venous insufficiency, Churg-Strauss syndrome, congestive heart failure, deep vein thrombosis, Degos disease, dehydration, diabetes mellitus, embolism, fibromuscular dysplasia, heart failure, hypertension, hypotension, hypothermia, kaposi’s sarcoma, leukocytoclastic vasculitis, livedoid vasculopathy, lymphangitis, lymphatic obstruction, lymphatic vessel dysplasia, lymphedema, papulosis maligna atrophicans, peripheral artery disease, polyarteritis nodosa, polyarteritis, post-thrombotic syndrome, Raynaud’s syndrome, sepsis, septic emboli, thromboangiitis obliterans, thrombotic thrombocytopenic purpura, varicose veins, vasculitis, venous valvular incompetence, Wegener’s granulomatosis
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| Chemical/Poisoning
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Arsenic, spider bites
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| Dental
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No underlying causes
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| Dermatologic
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Acquired perforating dermatosis, actinic keratosis, advanced age, allergic vasculitis, amebiasis cutis, contact dermatitis, continuous trauma, Crohn’s disease, cutaneous lymphoma ulcers, decubitus ulcer, ecthyma, erysipelas, erythema induratum of bazin, filariasis, furuncle, glanders, herpes simplex, keratoacanthoma, madura foot, melanoma, porphyria cutanea tarda, prolonged immobilization, radiodermatitis, sporotrichosis, squamous cell carcinoma, ulcerative colitis, xeroderma pigmentosum
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| Drug Side Effect
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Coumarin, ergotamine, cytostatic agents, halogens, hydroxyurea, leflunomide, methotrexate, penicillin, plasmin, plasminogen activator inhibitor-1, tissue plasminogen activator
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| Ear Nose Throat
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No underlying causes
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| Endocrine
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Diabetes mellitus, necrobiosis lipoidica
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| Environmental
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Burns, cold injury, contact dermatitis, heat, ionizing radiation, radiodermatitis
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| Gastroenterologic
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Crohn’s disease, ulcerative colitis
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| Genetic
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Fibromuscular dysplasia, factor V Leiden mutation, Gaucher’s disease, hereditary spherocytosis, Klinefelter syndrome, leukocyte adhesion deficiency, lymphatic vessel dysplasia, prolidase deficiency, tap1 mutation, thalassaemia, xeroderma pigmentosum
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| Hematologic
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Activated protein C resistance, anemia, antiphospholipid syndrome, antithrombin III deficiency, blood clot, cryoglobulinemia, deep vein thrombosis , dysproteinemia, essential thrombocythemia, factor V Leiden mutation, factor XIII deficiency, Felty’s syndrome, granulocytopenia, hereditary spherocytosis, Langerhans cell histiocytosis, leukemia, leukocyte adhesion deficiency, lupus anticoagulant, macroglobulinemia, myelodysplasia, plasmin, plasminogen activator inhibitor-1, polyclonal dysproteinemia, polycythemia, polycythemia vera, primary polycythemia, primary thrombocythemia, protein C deficiency, protein S deficiency, purpura, sickle cell anemia, thalassemia, thrombotic thrombocytopenic purpura,tissue plasminogen activator
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| Iatrogenic
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Calcinosis cutis, cytostatic agents, radiodermatitis, vaccinations
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| Infectious Disease
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Actinomycosis, amoebiasis cutis, amoebiasis, anthrax, bacillary angiomatosis, bacterial infection, bacteroides, blastomycosis, borrelia vincenti, cellulitis, coccidiomycosis, cold agglutinin disease, diphtheria, ecthyma, ecthyma gangrenosum, ecthyma, erysipelas, fasciitis necroticans, filariasis, folliculitis, francisella tularensis, furuncle, gas gangrene, glanders, granuloma inguinale, haemophilus ducreyi, herpes simplex, histoplasmosis, kala-azar, leishmaniasis, leprosy, lues maligna, lymphangitis, madura foot, mycobacterium ulcerans, mycosis fungoides, osteomyelitis, papillomatosis cutis carcinoides, poliomyelitis, rodent ulcer, sepsis, septic emboli, sporotrichosis, syphilis, tinea pedis, tropical ulcer, tuberculosis, tularemia, variola virus, vasculitis, yaws
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| Musculoskeletal/Orthopedic
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Badly united fractures, bone fractures
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| Neurologic
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Alcoholic neuropathy, autonomic dysfunction, cerebral palsy, dementia, diabetic neuropathy, hemiplegia, multiple sclerosis, neuropathy, spina bifida, spinal cord injury, spinal cord lesions, syringomyelia
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| Nutritional/Metabolic
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Calcinosis cutis, calciphylaxis, gout, hyperhomocysteinemia, malnutrition, necrobiosis lipoidica, porphyria cutanea tarda,starvation
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| Obstetric/Gynecologic
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No underlying causes
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| Oncologic
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Angiosarcoma, basal cell carcinoma, cold agglutinin disease, cutaneous lymphoma ulcers, leukemia, macroglobulinemia, Marjolin’s ulcer, melanoma, sarcoma, squamous cell carcinoma
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| Ophthalmologic
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No underlying causes
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| Overdose/Toxicity
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No underlying causes
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| Psychiatric
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Delirium, factitious ulceration
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| Pulmonary
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No underlying causes
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| Renal/Electrolyte
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Calciphylaxis
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| Rheumatology/Immunology/Allergy
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Rheumatoid arthritis
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| Sexual
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No underlying causes
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| Trauma
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Continuous trauma, bone fractures, lower limb nerve injury, Marjolin’s ulcer, shearing forces, spinal cord injury
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| Urologic
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No underlying causes
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| Miscellaneous
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Amyloidosis, decubitus ulcer, friction, low weight, Marjolin’s ulcer, prolonged immobilization, sarcoidosis
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